Tiger’s Eye / Hawk’s Eye
Golden and blue colours with a silky lustre
Tiger’s eye and hawk’s eye are quartz gemstones known for a silky lustre that changes as they move. Tiger’s eye generally displays golden, honey and brown tones, while hawk’s eye is known for blue-grey to dark blue colours.
Tilting the stone or changing the lighting makes some areas appear lighter and others darker. This movement of light gives depth and a cat’s-eye-like appearance. The effect is called chatoyancy.
Tiger’s eye and hawk’s eye at a gemological glance
| Property | Information |
|---|---|
| Material | Predominantly quartz, with fibrous inclusions and iron minerals |
| Main chemical composition | SiO₂ — silicon dioxide |
| Crystal system | The constituent quartz is trigonal; the stone is a polycrystalline aggregate |
| Colour | Tiger’s eye: golden yellow, honey and brown; hawk’s eye: blue-grey to dark blue |
| Transparency | Generally opaque |
| Hardness | Approximately 7 on the Mohs scale |
| Specific gravity | Approximately 2.6–2.7, depending on composition |
| Refractive index | A spot reading is generally around 1.54 |
| Lustre | Silky, sometimes vitreous on polished surfaces |
| Optical effect | Chatoyancy — a moving sheen caused by light reflected from aligned fibrous inclusions |
These are reference values. The stone's composition and associated minerals may affect test results.
What creates the silky lustre?
The stone contains fibrous inclusions aligned in similar directions. Light reflected from them creates the changing sheen as the stone moves.
The golden-brown colour is associated with iron oxides and hydroxides formed through alteration of amphibole minerals. The internal structure and orientation of the fibres influence the width and character of the light bands.
Cutting orientation therefore matters: a cabochon, with a smooth, domed upper surface, can emphasise the effect and the transitions between light and dark areas.
Hawk’s eye — blue-grey and silky lustre
Hawk’s eye is a quartz gemstone closely related to tiger’s eye, generally displaying blue-grey to dark blue tones. It also shows a silky lustre that moves as the stone or lighting changes. Its colour is linked to fibrous amphibole inclusions that are less altered and retain their blue colour. Some stones combine blue areas with golden-brown areas, creating a transition between the appearance of hawk’s eye and tiger’s eye.
Colour and treatments
Tiger’s eye may be heated, dyed or bleached to change its appearance. It is important to establish whether the colour is natural or treated, particularly in unusually coloured stones. The presence of silky lustre alone does not prove that the colour is untreated.
Sources around the world
South Africa is a familiar source of tiger’s eye. Another known source is the Pilbara region of Western Australia, where material combines golden bands with iron-rich minerals. Tiger’s eye from China has also been documented and studied.
Appearance varies between sources and between stones from the same source, so country of origin alone does not determine quality.
What affects quality and price?
When choosing tiger’s eye, we consider the strength of the silky lustre, the movement of light, the combination of colours and the polish. The natural pattern matters too: some stones have straight, orderly bands, while others show wavy, complex transitions.
A well-polished surface displays the effect clearly. Cracks, cavities and damaged edges may affect appearance and suitability for jewellery.
The connection with crocidolite and asbestos
Tiger’s eye and hawk’s eye contain a fibrous structure associated with crocidolite, the fibrous form of the mineral riebeckite, known as blue asbestos. In golden tiger’s eye, the fibres have altered to iron oxides and hydroxides; in blue hawk’s eye, the amphibole fibres are less altered and may remain within the quartz. It should not be assumed that all crocidolite has been replaced by quartz in every stone. The moving bands of light are an optical effect caused by light reflected from fibrous inclusions, rather than evidence of exposed fibres. Wearing an intact, polished stone should be distinguished from cutting, drilling or grinding, which may release dust and fibres. Asbestos risk is associated with inhalation of airborne fibres, so processing this material requires appropriate risk assessment and dust controls. The amount of crocidolite remaining in a particular stone cannot be established by appearance alone.
Cleaning and care
For gentle cleaning at home, use lukewarm water, a little mild soap and a soft cloth or brush, then dry.
Protect against impacts, high heat and sudden temperature changes. For dyed or treated stones, cleaning should suit the treatment. Store separately from gemstones and jewellery that could scratch them.
Spiritual meaning — tiger’s eye
Tiger’s eye is associated with vitality, focus and connecting intention with action. It symbolises practical progress from a steady foundation, maintaining calm and clarity when effort and perseverance are needed.
In spiritual symbolism, it is also connected with balancing extremes and seeing a situation from different angles. It can serve as a reminder to listen to different viewpoints, find common ground and combine willpower with creativity and sound judgement.
Spiritual meaning — hawk’s eye
Hawk’s eye is associated with a broad perspective, quiet observation and clarity of thought. It symbolises stepping back, recognising the bigger picture and choosing a considered response. In spiritual symbolism, it is also linked with intuition and honest, calm communication: a reminder to listen to one's inner voice and express thoughts clearly and with balance.
These meanings belong to the realm of belief and symbolism. They can give jewellery personal significance, but they are not proven gemological properties or a promise of healing, protection or a change in health.